Entwine or interlace (tree branches) to form a hedge or provide cover for an outdoor walkway.
Late Middle English: from an Old French variant of plaissier (see plash).
“He created the pleach walkway to the house over many years.”
The last stage of life; old age.
Senectitude comes from the Medieval Latin noun senectitūdō meaning “old age,” which in turn comes from Classical Latin senectūs, a derivative of the noun senex meaning “old man.” Senectitude entered English in the late 1700s, more precisely, in 1796 in Jonathan Swift’s Gulliver’s Travels